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Fusion offers a signature that can be checked to verify authenticity. Some publishers choose to implement IP whitelisting, though Fusion does not currently use a static IP, and this IP may change.
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Hashing
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Requests are signed according to a URL Hash. Please contact our team for hashing instructions by emailing integrationteam@purespectrum.com
IP Whitelisting
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We have 2 static IPs when implementing s2s postbacks:
Completes: 34.226.25.42
Reconciliations/Reversals: 52.72.64.15